Triplock

What does Triplock mean?

This alarm indicates that the drive has entered a Trip-Locked state, meaning it cannot be reset by simply pressing the [STOP/RESET] key. This usually occurs after a severe fault to ensure safety and require manual intervention.

• A critical internal hardware fault (e.g., short-circuit on output, DC bus overvoltage/undervoltage, IGBT failure) that requires manual investigation.
• Repeated occurrences of a specific fault (e.g., motor overload, ground fault) within a short period, indicating a persistent problem.
• Safety circuit activation (e.g., STO input) in a way that requires explicit re-enablement rather than a simple reset.
• Firmware or configuration corruption that prevents the drive from initializing correctly after a fault.
• External fault input (e.g., Fbk, digital input configured for external trip) remaining active after the primary fault condition has cleared.

Click steps to track your progress.

1. 1

   Record the specific fault code that led to the Triplock state (often displayed alongside or prior to Triplock).

2. 2

   Completely remove all AC input power to the drive. Wait for the DC bus voltage to discharge to a safe level (typically <50VDC) using a multimeter.

3. 3

   Restore AC input power to the drive. This power cycle typically clears a Triplock state if the underlying fault has been resolved and is not persistent.

4. 4

   If the Triplock persists, access the drive's internal fault history log via the keypad or communication software to identify the root cause fault.

5. 5

   Check all safety chain inputs (e.g., STO terminals) to ensure they are de-energized and then re-energized correctly according to the safety circuit design.

6. 6

   If the previous steps fail, contact technical support for potential advanced diagnostics, firmware re-initialization, or hardware replacement procedures.